Coating die, coating apparatus, and coating method

Abstract

A coating die, a coating apparatus, and a coating method are provided, and pertain to the field of battery technologies. The coating die includes a die body and a cleaning assembly. The die body has a receiving cavity, a feed port, and a discharge port. The cleaning assembly is located in the receiving cavity. The cleaning assembly includes a cleaning part and a driving part, the driving part being configured to drive the cleaning part to extend into the discharge port for cleaning of the discharge port. When the discharge port of the coating die needs to be cleaned, the cleaning part can be driven by the driving part of the cleaning assembly to extend into the discharge port. Debris or dried slurry in the discharge port can be discharged by the cleaning part in the process of extending into the discharge port, thereby cleaning the discharge port.

What is claimed is: 
     
         1 . A coating die, comprising:
 a die body having a receiving cavity, a feed port, and a discharge port; and   a cleaning assembly located in the receiving cavity, wherein the cleaning assembly comprises a cleaning part and a driving part, the driving part being configured to drive the cleaning part to extend into the discharge port to clean the discharge port.   
     
     
         2 . The coating die according to  claim 1 , wherein the driving part comprises:
 a transmission shaft fixed in the receiving cavity, wherein the cleaning part is connected to the transmission shaft such that rotation of the transmission shaft is configured to drive the cleaning part to extend into the discharge port.   
     
     
         3 . The coating die according to  claim 2 , wherein the cleaning part comprises:
 an elastic sheet, wherein a portion of the elastic sheet is wound around the transmission shaft, and another portion of the elastic sheet is configured to extend into the discharge port when the transmission shaft rotates.   
     
     
         4 . The coating die according to  claim 3 , wherein the elastic sheet comprises at least one of a metal elastic sheet and a plastic elastic sheet. 
     
     
         5 . The coating die according to  claim 1 , wherein the coating die further comprises:
 a cleaning strip, wherein the cleaning strip includes multiple non-perforated regions and perforated regions located between adjacent two non-perforated regions, and the multiple non-perforated regions are arranged along a length direction X of the cleaning strip,   wherein the cleaning strip abuts against the discharge port, and the cleaning strip is configured to move along a first direction Y relative to the discharge port so that the non-perforated regions clean debris at the discharge port.   
     
     
         6 . The coating die according to  claim 5 , wherein along the length direction X of the cleaning strip, length L 1  of the non-perforated regions is greater than or equal to 100 mm and less than or equal to 1000 mm. 
     
     
         7 . The coating die according to  claim 5 , wherein the die body includes a lip, the discharge port is located at the lip, and length L 2  of the perforated regions along the length direction X of the cleaning strip is greater than height H of the lip along the first direction Y. 
     
     
         8 . The coating die according to  claim 5 , wherein width D 1  of the cleaning strip is greater than width D 2  of the discharge port along a second direction Z, wherein the second direction Z is perpendicular to the first direction Y. 
     
     
         9 . The coating die according to  claim 8 , wherein the width D 1  of the cleaning strip is less than or equal to width D 3  of the die body along the second direction Z. 
     
     
         10 . The coating die according to  claim 6 , wherein the coating die further comprises a cleaning strip winding assembly, the cleaning strip winding assembly comprising:
 an unwind shaft, wherein the cleaning strip is wound on the unwind shaft; and   a wind shaft, wherein a free end of the cleaning strip bypasses the discharge port and is wound on the wind shaft.   
     
     
         11 . The coating die according to  claim 10 , wherein the coating die further comprises:
 a waste box in contact with at least one surface of the cleaning strip, the waste box being located between the die body and the wind shaft.   
     
     
         12 . The coating die according to  claim 2 , wherein the receiving cavity includes an opening, and the die body comprises:
 a cover plate covering the opening of the receiving cavity, wherein the cover plate includes a flow channel structure, wherein the flow channel structure is configured to connect the opening of the receiving cavity and the discharge port, one end of the cleaning part being located in the flow channel structure, and another end of the cleaning part passes through the opening and is connected to the driving part.   
     
     
         13 . The coating die according to  claim 12 , wherein the die body further comprises:
 an upper die body; and   a lower die body opposite the upper die body, wherein the receiving cavity is located in the lower die body, and the opening of the receiving cavity faces the upper die body, wherein the cover plate is located between the upper die body and the lower die body.   
     
     
         14 . The coating die according to  claim 13 , wherein the die body further comprises a pressure strip located in the receiving cavity, the pressure strip being used to fix the cover plate and the upper die body together;
 wherein the pressure strip includes a pressure strip groove, an opening of the pressure strip groove faces the cover plate, and the driving part is located in the pressure strip groove; and,   wherein the driving part comprises the transmission shaft, and the cleaning assembly further comprises at least two support blocks located in the pressure strip groove, wherein the transmission shaft passes through the at least two support blocks and is fixed in the pressure strip groove.   
     
     
         15 . The coating die according to  claim 14 , wherein the cleaning assembly comprises at least two cleaning parts, and at least one support block is located between any adjacent two cleaning parts. 
     
     
         16 . The coating die according to  claim 15 , wherein the cover plate includes multiple comb teeth, the comb teeth are in one-to-one correspondence with the support blocks in position, and the flow channel structure is formed between adjacent two comb teeth. 
     
     
         17 . A coating apparatus comprising
 a coating die, the coating die including:
 a die body having a receiving cavity, a feed port, and a discharge port; and 
 a cleaning assembly located in the receiving cavity, wherein the cleaning assembly comprises a cleaning part and a driving part, the driving part being configured to drive the cleaning part to extend into the discharge port to clean the discharge port. 
   
     
     
         18 . A method for coating using a coating apparatus, the method comprising:
 obtaining, during coating, information about a quality of a film layer formed by coating;   controlling the coating apparatus, the coating apparatus comprising a coating die, the coating die comprising:
 a die body having a receiving cavity, a feed port, and a discharge port; and 
 a cleaning assembly located in the receiving cavity, wherein the cleaning assembly comprises a cleaning part and a driving part, the driving part being configured to drive the cleaning part to extend into the discharge port to clean the discharge port, and 
   controlling, in response to the information about the quality of the film layer not meeting a preset condition, the driving part of the cleaning assembly to drive the cleaning part to extend into the discharge port for cleaning of the coating apparatus.   
     
     
         19 . The method according to  claim 18 , wherein the method further comprises:
 controlling a cleaning strip to move along a first direction so that non-perforated regions of the cleaning strip clean the coating apparatus.   
     
     
         20 . The method according to  claim 19 , wherein after cleaning the coating apparatus, the method further comprises:
 controlling a cleaning strip to move along the first direction so that a perforated region of the cleaning strip is opposite the discharge port; and   controlling the coating apparatus to discharge through the discharge port for coating.